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�..I Sad <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Page 2 <br /> III. Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 1300 <1.0 12 .31 Xylene 150 <0.005 .360 0.0019 <br /> TPH (Diesel) 220 <5.0 7.2 <.05 MTBE NA <5 0.028 <0.0005 <br /> Benzene 9.6 <0.005 .200 0.031 1,2-DCA <1 NA NA <.002 <br /> Toluene 66 <0.005 0.084 0.0017 <br /> Eth l-benzene 1 25 1<0.005 1 .130 10.034 <br /> Comments: Soil Before data is from soil beneath the USTs when they were removed on 4112191. Soil After <br /> data is from SB10 on 12/17/91 except MTBE is from HB11 on 7110197. Water Before data is from MW2 on <br /> 12/26/91 except MTBE is from MW1 on 6127196. Water After data is from MW2 on 12/21/08 except TPH diesel <br /> is from MW2 on 1014107 and 1,2-DCA is from MW2 on 215102. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per Regional Board Basin Plan? Yes <br /> Does corrective action protect public health for current land use? Yes <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes? Yes <br /> Have the MonitoringNapor wells been decommissioned? Yes Number Decommissioned: 5 <br /> Number retained: 0 <br /> List enforcement actions taken: NOR 04-11-1991 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature:- Dater 2—o O <br /> Vl. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: October 5, 2009 Response Date: October 20, 2009 <br /> RB Staff: James L.L. Barton Response: concurrence to NFA <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE. CLOSURE LETTER shall be retained by the lead agency as part of the <br /> official site fie. <br /> Mi/ <br />